<template>
  <div>
    <span>全选:</span>
    <input type="checkbox" v-model="full"/>
    <button @click="InvertFn">反选</button>
    <ul>
      <li v-for="(item,index) in arr" :key="index">
        <input type="checkbox" v-model="item.checked"/>
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
// import { set } from 'vue/types/umd';
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          checked: false,
        },
        {
          name: "孙悟空",
          checked: false,
        },
        {
          name: "唐僧",
          checked: false,
        },
        {
          name: "白龙马",
          checked: false,
        },
      ],
    };
  },
  computed: {
    full:{
      set(val){
        this.arr.forEach(item=>item.checked=val)
      },
      get(){
        return this.arr.every(obj=>obj.checked==true)
      }
    }
  },
  methods:{
    InvertFn(){
      this.arr.forEach(obj=>obj.checked=!obj.checked)
    }
  }
};
</script>

<style>
</style>